Steam-engine



(No Model.) 2 Sheets-Sheet 1.

E. G. SHORTT.

- STEAM ENGINE. Y No. 437,460. f Patented Sept. 30. v-1890.

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E. G.. SHORTT. STEAM ENGINE. No. 437,460. Patented-Sept. 30, 1890.

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JB 0 n5 36' EDVRD G. SHORTT, OF CARTHAGE, ASSIGNOR OF ONE-HALF TO CHARLES G. EMERY, OF BROOKLYN, NEW YORK.

STEAM-ENGINE.,

" SPECIFICATION forming part of Letters Patent No.` 437,460, dated September 30', 1890.

' Application iled December 12, 1889. Serial No. 333,478- (No model.)

.'ZoaZZ whom timmy concern.-

YBe it known that I, EDWARD G. SHoRTr, a citizen of the United States, residing at Carthage, in the county of Jefferson and State of New York, have invented new and useful Improvements in Steam-Engines, of Which the following is a specification.

'My present invention relates to that class of steam-engines having rocking valves of the type shown in United States Letters Patent No. 389,769, granted to me the 18th day of September, 1888.

,It is the purpose of my invention to provide a simple form of cylindrical reversing-valve, adapted to seat upon the concave face of the rocking valve of engines of this type, the reversing valve having alternating, duplex, live steam, and exhaust ports, and being seated upon the concave face of the rocking valve, and being adapted to reverse the engine by a revolution upon itsown axis of one hundred and eighty degrees, or to cut the steam eny tirely olf by a revolution of ninety degrees.

The present invention is an improvement upon the invention covered by the Letters Patent recited above,and alsoupon the Letters patent granted to me the 18th day of September,1sss,No. 389,770, andiueonsistsin the in elevation of the reversing-valve.

severalnovel features of construction and new combinations of parts hereinafter fully set forth and then definitely pointed out in the' claims following this specification.

Referring to the accompanying drawlngs, Figure 1 is a horizontal section upon a plane passing centrally through the valve. Fig. 2 isa cross-section of the rocking and reversing-valve, taken upon the line a, Fig. 1. Fig. 3 is a similar section of the same parts upon the line y y, Fig. 1, showing the valve in position to cut o the steam. Fig. 4 is a view Fig. 5 is a similar view of the same reversed. Fig. 6

isa ysectional elevation of the inner concave face, and Fig. 7 is a view'of the outer rearward face of the rocking valve.

VIn theV said drawings, the reference-nu- Y meral 1 denotes the duplex cylinders ofthe 'steam-engine, each having an independent piston 2. The steam-chest 3 is upon the front of the cylinder-casing, and is provided with meral 9 denotes the exhaust-openings, com -Y municating with passages 10 through ,the pistons and through the exhaust-pipe 12 in the rear. In all these respects the invention is not materially diiferent from the inventions contained in my said patents referred to above.

Arranged in the concave valve-seats 4 are oscillating valves 13, having each a stem 14 connected to the piston and lying in the exhaust-opening 9. This valve is provided with y live-steam ports 15, which alternate with each other on opposite sides of` transverse duplex exhaustopenings 16, and having exhaustports 17 alternating in like manner, and each communcatingwith one of the parallel trans verse exhaust-openings 16, The bod-ies of these valves are substantially cylindrical in form, and .each one is provided with a true cylindrical opening iitting steam-tight upon the reversing-valve, as hereinafter shown. The seating portion of each valve is designated by the numeral 18, and it contains the live-steam and exhaust ports. already described. This seating portion comprises one hundred and eighty degrees (more or less) of the entire cylindrical body, and the remaining portion of each consists of the shell ,19, which l is cut away upon its outer face, as shown in Figs. 2 and 3, thereby forming, when the valve is arranged upon its seat, a semi-annular chamber 2O within the steam-chest.. In each valve ports 21 and 22 are out through the semi-cylindrical shell 19, each port being diametrically opposite they septum which separates the live-steam and exhaust ports from each other upon each side'of the valve-stem. These rocking or oscillating valves i-nclose a ,so a concave valve-seat 4, having ports 5, oom-h cylindrical valve 23, having journals 24 at its v ends, which journals have bearing in the end walls of the steam-chest. This valve is coi communicate with a transverse channel 27,

, ing'the-upright or connecting part of the Z,

I Fig. 2, the two being separated by a web 28 y cillating cylindrical valves 13, as described,

f valve, the latter passing through a stuffingreversed.

Z-shaped exhaust-channels 26 in the cylin- 25a, cut entirely through the cylindrical body extensive in'length with the rocking valves 13, l and is provided with live-steam ports 25 and common to both exhaust-channels and formand similar channels are cut upon the opposite side of the cylindrical body, as shown in of metal. The reversing-valve has four livesteam ports or four of the exhaust-channels 26,two of the latter upon each side of the cylinder. It will be readily seen that by turning the valve through half of a revolution the relative positions of the live-steam ports Will be reversed, as in Figs. l and 5, while a similar reversal of the exhaust-channels 26 issimultaneously effected. This cylindrical valve being placed within the rocking or osmay be turned upon its axis by means of a lever or crank arm 29, mounted upon a prolongation 30 of one of the journals of the box 31. In this position it may be so placed that the rocking or oscillating valves 13 will supply live steam to and exhaust from the cylinders in a Vmanner clearly evident from the drawings and description. By rotating the valve 23 through an arc of ninety degrees steam is entirely cut off from the engine, while bycontinuin g the rotation until half a revolution is accomplished the engine will be While I have described the exhaust-openings or ports in the rocking valves 13 as cut into the transverse exhaust channels or openings 27 at their inner ends, it will readily be seen that by connecting the cylindrical valve 23 with the rocking valves 13, I am able to simplify this construction bymerely cutting all four of the ports in said valve 13 directly through the body of the valve 13. The

drical valve form the connections between the exhaust-ports and the exhaust-openings 16 lying between the said ports.

The valve-stems 14 are so connected with the pistons that the reciprocation of the latter produces an oscillation of the valves. At each oscillation of each valve the live-steam ports 21 register one with one of the livesteam ports 25 of the valve 23, and at the same time one of the ports 17 on the opposite part of the valve 13 registers with one of the exhaust -channels 26, which communicates with the other end of the cylinder, to which steam is flowing through the port 25. As the valve oscillates in the opposite direction, the port 22 upon the opposite side of the center of the valve registers with the live-steam port 25a, while the port 21 registers with the other end of the exhaust-channel 26. This operation is duplicated in each of the cylindrical valves at Y every stroke of the piston. The cu t-off, by turning the valve 23 through onehalf of a revolution, is so fully shown in Fig. 3 as to require no explanation, and the reversal of the engine by a revolution of saidVY valve through an arc of ninety degrees will readily be understood by comparing the relative positions of the live-steam and exhaust ports in Figs. 4t` and 5, respectively.

1. In a steam-engine having oscillating cylindrical valves provided with alternating live-steam and exhaust ports, a cylindrical reversing-valve arranged Within the oscillating valves and having alternating live steam ports cut entirely through the cylindrical body, said reversing-valve also provided with exhaust-channels cut into opposite faces and alternating with the live-steam ports, said alternating channels communicating with a central transverse channel, substantially` as described.

2. In a steam-engine having an oscillating hollow cylindrical valve or valves provided with alternating live -steam and exhaust ports,

a cylindrical reversing-valve lying within the said valve or valves and having journals bearing in the walls of the steam-chest, said reversing-valve having livesteam port-s cut through its body on opposite sides of the cylindrical axis and on opposite sides of one or more transverse lines coinciding with the exhaust-openings of the valve-seat, and being also provided with transverse channels on opposite sides of the cylindrical body cut in said transverse lines and communicating with exhaust-channels alternating with the steamports, substantially as described.

3. In a steam engine having a concave valve-seat provided with a line of ports and exhaust-openings c ut transversely between saidl ports, an oscillating hollow cylindrical valve or valves having live-steam ports and exhaust-ports arranged alternately on opposite sides of exhaust-openings cut transversely in line with those in the valve-seat, a cylindrical reversing-valve having journal-bearings in the valve-chest, one of said journals prolonged to extend through a stuffing-box, said valve having live-steam ports cut through its body on opposite sides ofits axis, and transverse channels registering with the exhaustopenings in the oscillating valve and pro- IIO vided with exhaust-channels alternating with the live-steam ports and communicating with the transverse channels, and lever being mounted on the projecting journal of the re- 5 versing-valve, and the front of the oscillating nature in presence of two Witnesses.

EDWARD G. SHORTT.

valves being cut away to form a steam-cham- Witnesses: ber and provided with ports, substantially as A. G. PECK, described. W. N. WRoPE.

In testixnony whereof I have affixed my sig- 

